At the 2004 Olympics, he won the bronze medal in the men's 1,500m freestyle, in a time of 14:45.95 (a British and European record).

Davies represented Great Britain at the 2008 Olympics, swimming in both the pool competition and open water race.

Shortly after finishing the event, there was concern for Davies' state of health as First Aid staff rushed to stretcher him off for medical attention.

I felt a bit violated to be honest, people swimming all over me, and the last lap was a real struggle.".

[4] Davies qualified for the Olympics 10K at the 2008 Open Water World Championships in Seville, Spain where he finished just 0.03 behind the winner.